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The Effect Of Light Intensity On The Rate Of Photosynthesis

836 words - 3 pages

The Effect of Light Intensity on the Rate of Photosynthesis


Aim: To investigate the affect of light intensity on the rate of

Theory: Before I predict what will happen I must look at how
photosynthesis occurs. Photosynthesis is the way plants create a
source of food for themselves. Photosynthesis requires the following
resources; Carbon Dioxide, Water and light.

Inside the leaves of a plant there is a green substance, this
substance is known as chlorophyll. Chlorophyll is in the Chloroplast
which are cells contained inside a plant. Chlorophyll absorbs sunlight
and then makes the energy from the sunlight available for chemical
reactions. This shows that Chlorophyll is used to convert light energy
to chemical energy. The plant can absorb carbon dioxide from the air.
It can also uptake water from the soil. A plant also requires nitrogen
and sulphur to create proteins; these can be acquired from nitrates
and sulphates which are minerals in the soil.

The equation for photosynthesis is:


How photosynthesis works. The process mainly takes place inside the
cells of plants, mainly in the leaves. Firstly the plant needs water;
this is absorbed from the soil, through the roots and is carried up
the stem by water vessels within the veins. Next the plant needs
carbon dioxide, this absorbed from the through pores in the leaf known
as stomata. Inside cells in the leaves the carbon dioxide is mixed
with water to make sugar, but in order for these to be able to mix a
source of energy is needed, this energy is gained from sunlight. The
sunlight is absorbed from a green pigment in plants called
chlorophyll. The chlorophyll is present within the chloroplast of the
leaf cells, which the reaction takes place in. Chloroplasts are small
green structures found in the cytoplasm of plant cells. Chlorophyll is
the substance that gives plants there green colour. It is able to
absorb energy from this light. The water molecules are split into

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